The quiet scene is just a part of relaxing and is optional. PR tons of books on meditation and you'll find something you like better than visualization. I do "come back to the present moment" type things instead of visualization things. If you need to think of yourself on a beach in order to relax then that's your quiet scene and that's all it's for. I have never thought of a quiet scene- I always think of the room I'm in at the time as the quiet place and that nothing else matters. That way I don't have to "think" to keep it going. That's the problem with positive thinking and visualization- it ends.
